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Journal of Fluorine Chemistry
Volume 131, Issue 2, February 2010, Pages 278-281
Alexey V. Gutov, Eduard B. Rusanov, Alexey B. Ryabitskii and Alexander N. Chernega
Octafluoro-4,4′-bipyridine and its derivatives: Synthesis, molecular and crystal structure
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http://dx.doi.org/10.1016/j.jfluchem.2009.11.022